An extension of the Michael reaction is described. CsF in the presence of Si (OR) 4 is found to be very efficient for carrying out Michael additions of monoketones and arylacetonitriles on different kinds of Michael acceptors: α, β unsaturated ketones, esters, nitriles. The reaction takes place with a stoichiometric amount of CsF and Si (OR) 4 and without solvent. Addition of different kinds of ketones can occur even with hindered Michael acceptors ...